Get random numbers in a specific range in java [duplicate]

Answer 1

First of, you have to create a Random object, such as:

Random r = new Random();

And then, if you want an int value, you should use nextInt int myValue = r.nextInt(max);

Now, if you want that in an interval, simply do:

 int myValue = r.nextInt(max-offset)+offset;

In your case:

 int myValue = r.nextInt(300)+200;

You should check out the docs:

http://docs.oracle.com/javase/6/docs/api/java/util/Random.html

Answer 2

Random rand = new Random(seed);
int random_integer = rand.nextInt(upperbound-lowerbound) + lowerbound;

Answer 3

The arg you pass to the constructor is the seed, not the bound.

To get a number between 200 and 500, try the following:

Random random = new Random(); // or new Random(someSeed);
int value = 200 + random.nextInt(300);

Answer 4

I think you misunderstand how Random works. It doesn't return an integer, it returns a Random object with the argument being the seed value for the PRNG.

Random rnd = new Random(seed);
int myRandomValue = 200 + rnd.nextInt(300);